Bodywork Modifications

Hood, trunk/decklid and doors may be aftermarket composite components.Vented hoods are approved on a car-by-car basis. Additional aftermarketcomposite components may be approved if deemed necessary to make acompetitive package. Front splitter may protrude 2″ from approvedfront fascia, but may be no wider than the tires at their widestpoint. Splitter may deviate vertically on the sides and bottom. Eachcar is permitted to run an approved rear wing.

Chassis Modifications

Interior may be removed except dashboard. Miscellaneous unused mounting brackets may be removed. Chassis seams may be welded. Doors must be capable of being opened from inside and outside. Driver’s seat may be moved rearward as long as the seat back at the driver’s shoulders does not pass the vertical plane of the rear seat shelf. Windshield wipers may be removed, but an operational motor must remain in place. Windows may be replaced with Lexan.

Safety Modifications

A full rollcage must be used. The rollcages typically have eight main attachment points within the cockpit/trunk. The A-pillar, B-pillar and roof may be stitch-welded to the rollcage. Fuel cells are required, unless stock fuel tank is located between frame rails and the axles.

Engine Modifications

Engines may be blueprinted and balanced. Full-prep engines may replace reciprocating internals. Custom intake manifolds may be allowed if deemed necessary. Engine management systems are free. Ignition system component may be replaced. Must maintain an operational on-board starter.

Dry sump systems are permitted. Forced induction is permitted and may be added to a car if deemed necessary to be a competitive package. Noise limit is 120 dBA. Traction control, and other commonly available electronic driver aids, are permitted.

Drivetrain Modifications

Transmission and differential coolers may be added. Limited-slip differentials are permitted.

Clutch and flywheel design are free, but start ring gear diameter must be stock. Driveshafts and halfshafts may be modified or replaced, but must be same material and type as OEM. Two sets of gear ratios are permitted. Sequential transmissions are permitted on most vehicles.

Suspension Modifications

The OEM-type of suspension must be retained (i.e. McPherson strut, double A-arm, etc.) Alternate control arms may be submitted for approval. Shocks and springs are free, but must remain in stock location. Anti-sway bars are free. Steering geometry may be modified to correct bump steer.

The suspension pick-up-points below the top of the tire may be relocated 25mm, and the suspension pick-up points above the tire may be relocated 75mm.

Brake System Modifications

OEM brake systems may be replaced with racing components. The maximum rotor size in GT is 380 mm x 30 mm minimum thickness front and 25 mm minimum thickness rear. The OEM caliper, any 4-piston caliper, or approved 6-piston calipers may be used. Water may be injected into the brake ducts. ABS is permitted. Carbon and Ceramic rotors are not permitted unless stock OEM components are being used.

Wheels

Wheel offset is free, provided the approved bodywork covers the portion of the tire that contacts the track.

The wheel diameter used in the GT class is 18″. The maximum wheel width range from 9.5″-13″ based on the tire size(s) permitted on each car. Magnesium wheels are permitted.

Tires

Not a vehicle class, the GT Sportsman GTA class is a driver classification to differentiate professional drivers from sportsman drivers in GT Class equipment. GTA drivers will compete for the Sportsman Cup. The qualifications for a GTA driver may include but not be limited to the FIA Bronze designations.

Vehicles currently allowed in this category: Porsche 991 GT3 Cup, Lamborghini Super Trofeo, and Ferrari 458 Challenge. Spec cup vehicle raced globally. This races as a separate class with the GT3 cars in PWC. Power is limited to 400 whp.

Bodywork Modifications

Chassis Modifications

Interior may be removed except dashboard. Miscellaneous unused mounting brackets may be removed. Chassis seams may be welded. Doors must be capable of being opened from inside and outside. Driver’s seat may be moved rearward as long as the seat back at the driver’s shoulders does not pass the vertical plane of the rear seat shelf. Windshield wipers may be removed, but an operational motor must remain in place.

Safety Modifications

A full rollcage must be used. The rollcages typically have eight main attachment points within the cockpit/trunk. The A-pillar, B-pillar and roof may be stitch-welded to the rollcage. Fuel cells are required, unless stock fuel tank is located between frame rails and the axles.

Engine Modifications

Engines may be blueprinted and balanced. Full-prep engines may replace reciprocating internals. Custom intake manifolds may be allowed if deemed necessary. Engine management systems are free. Ignition system component may be replaced. Must maintain an operational on-board starter.

Noise limit is 110dBa. Any ECU/PCM may be used without penalty. Dry sump systems are permitted. Any cold air induction kit may be used without penalty.

Drivetrain Modifications

Transmission and differential coolers may be added. Limited-slip differentials are permitted.

Suspension Modifications

The OEM-type of suspension must be retained (i.e. McPherson strut, double A-arm, etc.) Alternate control arms may be submitted for approval. Shocks and springs are free, but must remain in stock location. Anti-sway bars are free. Steering geometry may be modified to correct bump steer.

Brake System Modifications

Brake pads, fluid, proportioning valves and lines are unrestricted. ABS may be removed or deactivated. Some vehicles may be permitted aftermarket calipers or rotors.

Wheels

Wheel offset is free, provided the approved bodywork covers the portion of the tire that contacts the track.

Bodywork Modifications

Body panels are generally stock. Only OEM wings as delivered on the production car are permitted.

Chassis Modifications

Interior may be removed except dashboard. Miscellaneous unused mounting brackets may be removed. Chassis seams may be welded. Doors must be capable of being opened from inside and outside. Driver’s seat may be moved rearward as long as the seat back at the driver’s shoulders does not pass the vertical plane of the rear seat shelf. Windshield wipers may be removed, but an operational motor must remain in place.

Safety Modifications

A full rollcage must be used. The rollcages typically have eight main attachment points within the cockpit/trunk. The A-pillar, B-pillar and roof may be stitch-welded to the rollcage. Fuel cells are required, unless stock fuel tank is located between frame rails and the axles.

Engine Modifications

Engines may be blueprinted and balanced. Full-prep engines may replace reciprocating internals. Custom intake manifolds may be allowed if deemed necessary. Engine management systems are free. Ignition system component may be replaced. Must maintain an operational on-board starter.

Noise limit is 110dBa. Only electronic driver aids installed from the factory are permitted.

Drivetrain Modifications

Transmission and differential coolers may be added. Limited-slip differentials are permitted.

Suspension Modifications

The OEM-type of suspension must be retained (i.e. McPherson strut, double A-arm, etc.) Alternate control arms may be submitted for approval. Shocks and springs are free, but must remain in stock location. Anti-sway bars are free. Steering geometry may be modified to correct bump steer.

Brake System Modifications

Brake pads, fluid, proportioning valves and lines are unrestricted. ABS may be removed or deactivated. Some vehicles may be permitted aftermarket calipers or rotors.

Wheels

Wheel offset is free, provided the approved bodywork covers the portion of the tire that contacts the track.

Bodywork Modifications

Chassis Modifications

Interior may be removed except dashboard. Miscellaneous unused mounting brackets may be removed. Chassis seams may be welded. Doors must be capable of being opened from inside and outside. Driver’s seat may be moved rearward as long as the seat back at the driver’s shoulders does not pass the vertical plane of the rear seat shelf. Windshield wipers may be removed, but an operational motor must remain in place.

Safety Modifications

A full rollcage must be used. The rollcages typically have eight main attachment points within the cockpit/trunk. The A-pillar, B-pillar and roof may be stitch-welded to the rollcage. Fuel cells are required, unless stock fuel tank is located between frame rails and the axles.

Engine Modifications

Engines may be blueprinted and balanced. Full-prep engines may replace reciprocating internals. Custom intake manifolds may be allowed if deemed necessary. Engine management systems are free. Ignition system component may be replaced. Must maintain an operational on-board starter.

Drivetrain Modifications

Transmission and differential coolers may be added. Limited-slip differentials are permitted.

Suspension Modifications

The OEM-type of suspension must be retained (i.e. McPherson strut, double A-arm, etc.) Alternate control arms may be submitted for approval. Shocks and springs are free, but must remain in stock location. Anti-sway bars are free. Steering geometry may be modified to correct bump steer.

Brake System Modifications

Brake pads, fluid, proportioning valves and lines are unrestricted. ABS may be removed or deactivated. Some vehicles may be permitted aftermarket calipers or rotors.

Wheels

Wheel offset is free, provided the approved bodywork covers the portion of the tire that contacts the track.

Bodywork Modifications

Chassis Modifications

Interior may be removed except dashboard. Miscellaneous unused mounting brackets may be removed. Chassis seams may be welded. Doors must be capable of being opened from inside and outside. Driver’s seat may be moved rearward as long as the seat back at the driver’s shoulders does not pass the vertical plane of the rear seat shelf. Windshield wipers may be removed, but an operational motor must remain in place.

Safety Modifications

A full rollcage must be used. The rollcages typically have eight main attachment points within the cockpit/trunk. The A-pillar, B-pillar and roof may be stitch-welded to the rollcage. Fuel cells are required, unless stock fuel tank is located between frame rails and the axles.

Engine Modifications

Engines may be blueprinted and balanced. Full-prep engines may replace reciprocating internals. Custom intake manifolds may be allowed if deemed necessary. Engine management systems are free. Ignition system component may be replaced. Must maintain an operational on-board starter.

Drivetrain Modifications

Transmission and differential coolers may be added. Limited-slip differentials are permitted.

Suspension Modifications

The OEM-type of suspension must be retained (i.e. McPherson strut, double A-arm, etc.) Alternate control arms may be submitted for approval. Shocks and springs are free, but must remain in stock location. Anti-sway bars are free. Steering geometry may be modified to correct bump steer.

Brake System Modifications

Brake pads, fluid, proportioning valves and lines are unrestricted. ABS may be removed or deactivated. Some vehicles may be permitted aftermarket calipers or rotors.

Wheels

Wheel offset is free, provided the approved bodywork covers the portion of the tire that contacts the track.